Note 3 - Loans and Allowance for Credit Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 44,721,000	$ 35,974,000	$ 42,246,000	$ 35,363,000
Financing Receivable, Credit Loss, Expense (Reversal)	3,300,000	2,900,000	5,900,000	3,500,000
Charge-offs	(243,000)	0	(810,000)	(219,000)
Recoveries	230,000	246,000	672,000	876,000
Balance	48,008,000	39,120,000	48,008,000	39,120,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(400,000)
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Balance	6,472,000	8,608,000	10,203,000	10,782,000
Financing Receivable, Credit Loss, Expense (Reversal)	2,500,000	1,110,000	(1,123,000)	518,000
Charge-offs	0	0	(218,000)	(170,000)
Recoveries	26,000	22,000	136,000	181,000
Balance	8,998,000	9,740,000	8,998,000	9,740,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(1,571,000)
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Balance	304,000	446,000	490,000	420,000
Financing Receivable, Credit Loss, Expense (Reversal)	31,000	21,000	(167,000)	117,000
Charge-offs	0	0	0	(29,000)
Recoveries	22,000	1,000	34,000	3,000
Balance	357,000	468,000	357,000	468,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(43,000)
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Balance	5,838,000	5,578,000	5,914,000	6,045,000
Financing Receivable, Credit Loss, Expense (Reversal)	627,000	372,000	495,000	407,000
Charge-offs	(40,000)	0	(54,000)	0
Recoveries	9,000	22,000	79,000	80,000
Balance	6,434,000	5,972,000	6,434,000	5,972,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(560,000)
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Balance	8,689,000	9,249,000	9,242,000	12,990,000
Financing Receivable, Credit Loss, Expense (Reversal)	564,000	(206,000)	11,000	(1,413,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance	9,253,000	9,043,000	9,253,000	9,043,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(2,534,000)
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Balance	3,700,000	1,639,000	2,191,000	2,006,000
Financing Receivable, Credit Loss, Expense (Reversal)	(1,071,000)	77,000	426,000	317,000
Charge-offs	0	0	0	0
Recoveries	6,000	23,000	18,000	37,000
Balance	2,635,000	1,739,000	2,635,000	1,739,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(621,000)
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Balance	19,498,000	10,267,000	14,027,000	2,449,000
Financing Receivable, Credit Loss, Expense (Reversal)	726,000	1,530,000	6,317,000	3,587,000
Charge-offs	(201,000)	0	(513,000)	(2,000)
Recoveries	161,000	154,000	353,000	522,000
Balance	20,184,000	11,951,000	20,184,000	11,951,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				5,395,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Balance	199,000	165,000	160,000	626,000
Financing Receivable, Credit Loss, Expense (Reversal)	(56,000)	(13,000)	(40,000)	(74,000)
Charge-offs	(2,000)	0	(25,000)	(18,000)
Recoveries	6,000	24,000	52,000	53,000
Balance	147,000	176,000	147,000	176,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(411,000)
Unallocated Financing Receivables [Member]
Balance	21,000	22,000	19,000	45,000
Financing Receivable, Credit Loss, Expense (Reversal)	(21,000)	9,000	(19,000)	41,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance	$ 0	$ 31,000	$ 0	31,000
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				$ (55,000)